Sulfur dyestuffs and process of making same.



ALIBRECH'I' SCHMIDT AND GUSTAV KRON'LEIN 0F HOCHST-ON THE-MAIN, GERMANY,

ASSIGNORS TO FARBWERKE VORM. MEISTER LUCIUS & BRI TNING, OF HOCHST-ON- THE-MAIN, GERMANY, A CORPORATION OF GERMANY. M

SULFUR DYESTUFFS AND PROCESS MAKING SAME.

No Drawin'g'.

To' all whom it may concern Be .it known that we, ALBRECHT SCHMIDT, Ph. D., chemist, and GUSTAV KRoNLEIN, Ph. 1)., chemist, citizens of the Empire of Germany, residing at Hochst-on-the-Main, Germany, have iniented certain new and useful Improvements in Sulfur Dyestuffs and Processes of Making Same, of which the following is a specification.

In U. S. patent-application Ser. No. 763,431 filed April 24, 1913, are described new indophenolsulfonic aeids'of the general formula;

O,,H,(NX) seat .N=Ar:()

wherein X stands for the series: H, methyl, ethyl, etc; It for a cation (H, K, Na, (NI-I etc); and Ar for an arylene residue and their leuco-compounds, said new acids being obtainable from carbazol- 0r alkylcarbazol-monosulfonic acids, by the action of nitrosophenols or p-aminophe'nols.

' Now we have found that by heating said new indophenolsulfonic acids with alkali.- polysulfids, dyestuffs are obtained which are readily soluble in alkali-sulfids and readily give dyeings of remarkable fastness to the action of chlorin. This is an unexpected result, because, as is known, no proper sulfur-dyestuffs are obtained by heating the indophenols of the carbazol series, particularly the alkylcarbazol series, but, instead, vat-dyestuffs, which only dye from the hydrosulfite rat, and give in sodium-sulfid solution only weak dyeings or no dyeings at all.

The following example illustrates our invention: 10 kilos of indophenolsulfonic acid, or the corresponding quantity of the paste, obtained according to said application, by

' condensing, for instance, nitrosophenol with carbarzolor N-methylor ethyl-carbazolmonosulfonic acid, are introduced into a solution of 30 kilos of crystallized sodium sulfid, 16.5 kilos of sulfur and 15. kilos of water, and the mass is heated on the refluxapparatus to boiling for lS'hours, while stirring. The solution produced may be directly used for dyeing, or air may first be bloun into the dyestull' andthen the latter salted out. I The dyestuii' thus obtained dyes cotton, from a bath containing alkali-sulfid,

Specification of Letters Patent.

Patented Feb. 16, 191;).

Application filed April 24, 1913. Serial No. 763.432..

dark blue tints. When the indophenol .sulfonic acid employed is made from p-nitrosophenol and carbazol-monosulfonic acid, it has the formula In the process of sulfurizing the dyestuif, the usual variations can be practised; for instance the proportion of the polysulfid, the concentration of the sulfurizing mass, and also the solvent, may beivaried. F urthermore, in the place of the indophenolsulfonic o n, (NX) (803R) .nzarzo' wherein X stands for the series: H, methyl, ethyl, alkyl; It for a cation; and Ar for an arylene residue, with sulfur and alkali sul-' fids.

The process of manufacturing a sulfur dyestufl, fast to chlorin and readily soluble, which consists intreating with sulfur and an alkali sulfid the indophenolsulfonic acid C,-,H6(NH) so nynzoaazo produced from p-nitrosophenol and carbazol-monosulfonic acid. a

As new products, the blu sulfur dyestuffs, obtained by treating an indophenolsulfonic acid of the general formula:

wherein X stands for the series: II, methyl, ethyl, alkyl; It for a cation; and Ar for an arylene residue, with sulfur and alkali sulfids, said dyestuffs being fast to the action of chlorin and light, readily soluble in water, soluble with a blue color in, concentrated sulfuric acid, insoluble in" organic ol\'ents, capable of being precipitated by the addition of common salt and acids, or by blowing air into ,the fusion, and being suitable for dyeing with use of apparatus.

4. As a new product, the blue sulfur-dyesniff, obtainable by Heating with sulfur and produced from p-nitros0phen01 and carbazoi-monosn1fcnic acid, said dyestuffs being fast $0 the action of chlorin and light, readily soluble in Water, soluble with a blue color in concentrated sulfuric acid, insoluble in organic solvents, capable of being precipisated by the addition of common salt and acids, or by blowing air into the fusion, and being suitable for dyeing with use of apparatus.

In testimony whereof, we aflix our signatures in presence of two witnesses.

. ALBRECHT SCHMIDT.

GUSTAV KRONLEIN.

W itnesses:

JEAN GRUND, CARL GRUND.

this patent may be Obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0." 

